Re: [Networker] backup mail server very slow (linux)
2004-04-29 08:52:41
I forgot to mention that - of course - the backup is done on SDLT tapes.
And the server itself seems to be ok, no problem with any of the other
clients.
David
On 29 Apr 2004, at 14:43, Michael Persson wrote:
Hi
There is a known bug in Solaris which only arise only under special
circumstances with using several sessions. We had a similar problem
this
year on a very large site when only 1 client was running we got very
good
speed of 30MB/s but when we increased the number of sessions the speed
instantly dropped to around 4MB/s. There is a patch in the works, it's
easy
to verify though.
Does the server in question have the necessary HW to push data usually
GB
interfaces eat 1 processor, but it shouldn't justify 100KB/s :-)
Uppgrading the NetWorker client though and to the latest kernel, that's
where I'd start.
Regards
Michael Persson
-----Original Message-----
From: David De Maeyer [mailto:ddm AT RUC DOT DK]
Sent: den 29 april 2004 14:26
To: NETWORKER AT LISTMAIL.TEMPLE DOT EDU
Subject: Re: [Networker] backup mail server very slow (linux)
RAID is one big partition and parallelism is on 4 for the client. I
thought
increasing the parallelism on the client.
David
___________________________________________________
David De Maeyer
Roskilde University Center, Department of Computer Science
Box 260, Hus 42.1, 4000 Roskilde, Denmark
voice (+45) 46 74 38 29 / fax (+45) 46 74 30 72
On 29 Apr 2004, at 14:19, agascoyn wrote:
Hi David
How is your raid setup.
Is it one big partition or groups of smaller partitions.
Also what is your parellalism set to currently.
Andrew Gascoyne
Data Backup / Recovery Administrator
David De Maeyer wrote:
Hi all!
We are facing a performance issue when taking a full backup of our
mail server (>7000 users, 350 GB of data, running Debian linux).
The backup server has no problem with the other linux clients. It is
writing at around 100 KB/s... which is far from the 2 to 8 MB/s we
are used to have on the other clients.
It takes forever to backup all the user directories! And we simply
can't find where the bottleneck is... just that there are a lot of
I/O on the RAID on which these directories are stored.
Would it help to increase/decrease the parallelism for the client
and/or other clients (smaller filesystems)?
Does somebody on this mailing-list once faced a similar problem? Is
the upgrade of the client on the mail server a must?
Regards,
David
server: NetWorker 7.1.1 (running Solaris 8)
client: NetWorker 6.1.1 (running Debian linux, IMAP server, 350 GB on
external RAID)
___________________________________________________
David De Maeyer
Roskilde University Center, Department of Computer Science Box 260,
Hus 42.1, 4000 Roskilde, Denmark voice (+45) 46 74 38 29 / fax (+45)
46 74 30 72
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Andrew Gascoyne
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European Southern Observatory
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EMail: agascoyn AT eso DOT org
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